(Reuters) - While people who voted for President Donald Trump are still largely supportive of his immigration policies, their approval has eroded somewhat since he took office, according to Reuters/Ipsos polling.

U.S. President Donald Trump reacts as he departs the White House for a trip to Lewisburg, West Virginia, in Washington D.C., U.S. April 5, 2018. REUTERS/Carlos Barria

As Trump plans to send troops to the U.S.-Mexico border, here are some key findings from an ongoing Reuters/Ipsos immigration poll:

ALL ADULTS

** 41 percent said in March they approve of Trump’s immigration policies, down from 48 percent in February 2017.

** 21 percent said they “strongly approve” of Trump’s handling of U.S. immigration, down from 27 percent in February 2017.

** 38 percent said they “strongly disapproved,” up from 31 percent in February 2017.